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Preserve full shadow memtransfers #2872

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4 changes: 4 additions & 0 deletions enzyme/Enzyme/AdjointGenerator.h
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Original file line number Diff line number Diff line change
Expand Up @@ -3653,6 +3653,10 @@ class AdjointGenerator : public llvm::InstVisitor<AdjointGenerator> {
}
}

if (size != 0) {
toIterate.emplace_back(nullptr, 0, size);
}

for (auto &&[floatTy_ref, seg_start_ref, seg_size_ref] : toIterate) {
auto floatTy = floatTy_ref;
auto seg_start = seg_start_ref;
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32 changes: 32 additions & 0 deletions enzyme/test/Enzyme/ReverseMode/full-shadow-memcpy.ll
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Original file line number Diff line number Diff line change
@@ -0,0 +1,32 @@
; RUN: %opt < %s %newLoadEnzyme -enzyme-preopt=false -passes="enzyme" -S | FileCheck %s

%State = type { ptr, double, ptr, double }

define void @scatter(ptr byval(%State) align 8 %arg) {
entry:
%local = alloca %State, align 8
call void @llvm.memcpy.p0.p0.i64(ptr align 8 %local, ptr align 8 %arg, i64 32, i1 false)
%out.gep = getelementptr inbounds %State, ptr %local, i32 0, i32 0
%out = load ptr, ptr %out.gep, align 8
%scale.gep = getelementptr inbounds %State, ptr %local, i32 0, i32 1
%scale = load double, ptr %scale.gep, align 8
%in.gep = getelementptr inbounds %State, ptr %local, i32 0, i32 2
%in = load ptr, ptr %in.gep, align 8
%x = load double, ptr %in, align 8
%res = fmul double %x, %scale
store double %res, ptr %out, align 8
ret void
}

declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1)

define void @caller(ptr %arg, ptr %darg) {
entry:
call void (...) @__enzyme_autodiff(void (ptr)* @scatter, ptr %arg, ptr %darg)
ret void
}

declare void @__enzyme_autodiff(...)

; CHECK: define internal void @diffescatter(ptr byval(%State) align 8 %arg, ptr align 8 %"arg'")
; CHECK: call void @llvm.memcpy.p0.p0.i64(ptr align 8 %{{.*}}, ptr align 8 %"arg'", i64 32, i1 false)
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